Some of those attending the meeting shouted “the Amazon region is burning” as Mr Salles stepped onto the podium.

Conservationists have blamed Brazil’s government for the Amazon’s plight.

They say Brazil’s far-right president, Jair Bolsonaro, has encouraged the clearing of land by loggers and farmers thereby speeding up the deforestation of the Amazon rainforest.

The largest rainforest in the world, the Amazon is a vital carbon store that slows down the pace of global warming.

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Media captionHow is the rainforest helping to limit global warming?

What happened?

Mr Salles took to the stage at the Latin American and Caribbean Climate Week in the Brazilian city of Salvador on Wednesday.

The conference, organised by the United Nations, aims to promote action on climate change in the region and is attended by representatives from non-governmental organisations, businesses and educational organisations among others.

As soon as his name was announced those attending the opening session of the plenary booed and shouted, only a few people clapped.

News agency AFP posted video of the event on Twitter.

What are people upset about?

Climate activists and conservationists have been scathing about the government of Jair Bolsonaro and its policies, which favour development over conservation.

They say that since President Bolsonaro took office the Amazon rainforest has suffered losses and an accelerated rate.

Their anger was further fuelled by satellite data showing a steep rise in fires in the Amazon region this year. The figures suggest there have been more than 74,000 fires so far this year, compared to just over 40,000 over the same period in 2018.

Meanwhile, US space agency Nasa said that overall fire activity in the Amazon basin was slightly below average this year.

The region is home to about three million species of plants and animals, and one million indigenous people.

How has President Bolsonaro reacted?

President Bolsonaro further angered those concerned over the spike in fires by brushing off the latest data.

He argued that it was the season of the “queimada”, when farmers burn land to clear it before planting but Inpe has noted that the number of fires is not in line with those normally reported during the dry season.

The president also joked about the criticism directed against him, saying “I used to be called Captain Chainsaw. Now I am Nero, setting the Amazon aflame.”

Later he appeared to suggest that non-governmental organisations had set fires, as revenge for his government slashing their funding. He presented no evidence and gave no names to support this theory, saying there were “no written records about the suspicions”.

“So, there could be…, I’m not affirming it, criminal action by these ‘NGOers’ to call attention against my person, against the government of Brazil. This is the war that we are facing,” he said on Wednesday.

What causes the fires?

Wildfires often occur in the dry season in Brazil but they are also deliberately started in efforts to illegally deforest land for cattle ranching.

“The dry season creates the favourable conditions for the use and spread of fire, but starting a fire is the work of humans, either deliberately or by accident,” Inpe researcher Alberto Setzer told Reuters news agency.

Ricardo Mello, head of the World Wide Fund for Nature (WWF) Amazon Programme, said the fires were “a consequence of the increase in deforestation seen in recent figures”.

Over the past decade, previous Brazilian governments had managed to reduce deforestation with action by federal agencies and a system of fines.

But Mr Bolsonaro and his ministers have criticised the penalties and overseen a fall in confiscations of timber and convictions for environmental crimes.